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Don't know if it is still true. DNS lookup didn't work correctly when ipv6 was enabled.

W..what? I don't think this has been true for any Firefox version, ever. Certainly I'm using v6 right now. (Not on hn of course, it's v4 only)

It was true for a Linux + Firefox combination a few versions ago. I had that issue.

Basically, the DNS lookup lasted like 4-5 times longer than it did while opening the same site in Chrome.

It used to be issue - in your local network, you had IPv6 automatically with Vista and newer (the same for Linux distributions). So your browser resolved AAAA records, trued o open connection to the the host, after few seconds found out that it is going nowhere, resolved the A records, the site worked.

So it became popular to manually disable IPv6 to speed up the browsing.

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